Thermogravimetric analysis (TGA) measures weight lost during thermal or oxidative decomposition. While this technique is an excellent tool for determining the relative amounts of each component of a material, it does not give any indication of the chemical content of those components. Chemical content can be determined by sampling the gas evolved from the sample decomposition using a variety of techniques. Fourier transformation infrared spectroscopy (FRIR) determines chemical structure of the gases from the energy absorbed by bond bending and stretching. A heated transfer line couples the outlet of the TGA to the FTIR inlet for optimal sampling of the off-gases.
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